CN101796423B - Production testing of a capacitive touch sensing device - Google Patents

Production testing of a capacitive touch sensing device Download PDF

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Publication number
CN101796423B
CN101796423B CN2008800142166A CN200880014216A CN101796423B CN 101796423 B CN101796423 B CN 101796423B CN 2008800142166 A CN2008800142166 A CN 2008800142166A CN 200880014216 A CN200880014216 A CN 200880014216A CN 101796423 B CN101796423 B CN 101796423B
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sensing device
touch sensing
capacitive touch
production test
value
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CN2008800142166A
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CN101796423A (en
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J·K·雷纳德斯
P·K·拉马拉普
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Synopsys Inc
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Synopsys Inc
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
    • G01R31/2834—Automated test systems [ATE]; using microprocessors or computers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/08—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for safeguarding the apparatus, e.g. against abnormal operation, against breakdown
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/12—Measuring electrostatic fields or voltage-potential
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/24—Arrangements for measuring quantities of charge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/01—Subjecting similar articles in turn to test, e.g. "go/no-go" tests in mass production; Testing objects at points as they pass through a testing station
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
    • G01R31/2829—Testing of circuits in sensor or actuator systems
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/9607—Capacitive touch switches
    • H03K2217/960705—Safety of capacitive touch and proximity switches, e.g. increasing reliability, fail-safe

Abstract

In one embodiment, a method for production testing of a capacitive touch sensing device is disclosed. In this embodiment, the present technology for production testing of a capacitive touch sensing device samples a first value corresponding to a first channel of a capacitive touch sensing device when the capacitive touch sensing device is in production. The present embodiment also samples a second value corresponding to the first channel of the capacitive touch sensing device when the capacitive touch sensing device has a self-test capacitive circuit applying a signal thereto. The present embodiment compares the first value and the second value to determine a production testing result for the first channel of the capacitive touch sensing device, wherein the sampling of the second value and the comparing the first value and the second value occur during production of the capacitive touch sensing device.

Description

The production test of capacitive touch sensing device
Relevant U. S. application
The application number that the application requires on May 8th, 2007 to submit to is 60/928; 462, attorney is the right of priority of SYNA-20070412-A3.PRO, denomination of invention pending trial temporary patent application for " production test of capacitance-type sensing device " time; This temporary patent application is transferred the application's assignee, comprises its full content by reference at this.
Background technology
Capacitive touch sensing device has important use in many application and system.For example, capacitive type touch pad is generally used in the portable computer.Similarly, capacitive touch screen is common in Automatic Teller Machine (ATM), airport registration booth and actual countless other equipment.Also prove capacitive touch sensing device as portable music player, PDA(Personal Digital Assistant) and cell phone etc. than skinny device in be useful.Along with the application of capacitive touch sensing device and the increase of corresponding demand, must improve the speed of producing this type capacitive touch sensing device.
In order to satisfy the demand to capacitive touch sensing device, corresponding production run must reach suitable turnout.In addition, these production runes must still be practiced thrift cost.In addition, in order to guarantee CSAT, the capacitive touch sensing device of production must be abideed by the standard and the performance requirement work of promising to undertake.
A kind of method that the capacitive touch sensing device that assurance is produced satisfies the respective performances requirement is to use test board or similar each capacitive touch sensing device of testing apparatus manual test.This method takes time and effort and is too expensive.Thereby this method is impracticable.Though being carried out random inspection, the capacitive touch sensing device of producing can reduce relevant time, labour and the cost of test with the capacitive touch sensing device of producing, but still might be with the standard of satisfied promise and the capacitive touch sensing device of performance requirement be sold to the client.
Thereby it is favourable possessing and not having the method for the testing capacitor of above-mentioned defective formula touch sensing device.Further, the method that the capacitive touch sensing device that possesses the standard that can guarantee will not satisfy promise and performance requirement is sold to client's testing capacitor formula touch sensing device is favourable.
Summary of the invention
In one embodiment, a kind of method that is used for the production test of capacitive touch sensing device is disclosed.In this embodiment, when producing capacitive touch sensing device, be used for this technology sampling first value corresponding of the production test of capacitive touch sensing device with first channel (channel) of capacitive touch sensing device.When capacitive touch sensing device makes the condenser network of testing oneself apply signal to capacitive touch sensing device, present embodiment second value corresponding of also sampling with first channel of capacitive touch sensing device.Present embodiment is this first value and second value relatively, to confirm the production test result to first channel of capacitive touch sensing device, wherein, in the process of producing capacitive touch sensing device, carries out the sampling of second value and the comparison of first value and second value.
Description of drawings
Fig. 1 is the synoptic diagram according to the production test system that is connected to capacitive touch sensing device of the embodiment of the invention.
Fig. 2 is the detailed schematic circuit diagram according to the condenser network of testing oneself among Fig. 1 of the embodiment of the invention.
Fig. 3 is the process flow diagram of describing according to the embodiment of the invention that is used for capacitive touch sensing device is carried out the method for production test.
Unless stated otherwise, the employed accompanying drawing of this instructions is not drawn in proportion.
Embodiment
Specify embodiments of the invention below, wherein accompanying drawing shows the example of the embodiment of the invention.Though will combine embodiment to describe the present invention, should be appreciated that embodiment is not intended to the present invention is restricted to these embodiment.On the contrary, the present invention is intended to cover alternative, variation and the equivalent that possibly comprise within the spirit and scope of the present invention.In addition, in the detailed description of the present invention,, many details have been set forth below for the ease of at large understanding the present invention.Yet need not these details also can embodiment of the present invention.In addition, known method, process, parts and circuit are not described in detail, in order to avoid make aspect of the present invention produce unnecessary bluring.
With reference now to Fig. 1,, Fig. 1 illustrates the synoptic diagram of the production test system that is connected to capacitive touch sensing device.Below discussion will be at first physical arrangement according to an embodiment of the invention be described in detail with reference to figure 1 and Fig. 2.Then, will with reference to 300 pairs of the process flow diagrams of figure 3 according to an embodiment of the invention operation be described in detail.In the embodiment in figure 1, sensor circuit 102 is shown and comprises the condenser network 104 of testing oneself.Among the embodiment; Go up realization sensor circuit 102 at special IC (ASIC); Wherein this ASIC is custom-designed and is configured to and the sensor electrode collaborative work of capacitive touch sensing device (for example, measuring the value that receives from the sensor electrode of capacitive touch sensing device).Description below in conjunction with Fig. 2 is described in detail the condenser network 104 of testing oneself.
In the embodiment in figure 1, sensor circuit 102 is connected to three sensor electrodes through cabling (trace) 108a, cabling 108b and cabling 108c respectively, i.e. sensor electrode 106a, sensor electrode 106b and sensor electrode 106c.Though Fig. 1 shows three sensor electrodes, be equally applicable to comprise a sensor electrode, two sensor electrodes or more than the capacitive touch sensing device of three sensor electrodes according to embodiments of the invention.In addition, according to embodiments of the invention be equally applicable to have Any shape, the sensor electrode of size or pattern.In addition, should be appreciated that in according to one embodiment of present invention, capacitive touch sensing device is by the element definition that comprises in the frame of broken lines 109.Particularly, in an embodiment according to the present invention, test cell 110 is a physical separation with capacitive touch sensing device.In addition,, should be appreciated that in according to one embodiment of present invention, the production test system comprises test cell 110 for the present invention.Fig. 1 also comprises the object 112 (for example, finger, contact pilotage, directing object etc.) of proximity transducer electrode 106a, 160b and 106c.Should be appreciated that along with capacitive touch sensing device 109 is shifted to or left to object 112, changing appears in the capacitance that capacitive touch sensing device can observe measurement.
Still with reference to figure 1, test cell 110 is shown with capacitive touch sensing device 109 and separates.Be suitable for equally at least a portion of the condenser network 104 of testing oneself is included in the test cell 110 according to embodiments of the invention.Similarly, be suitable for equally at least a portion of test cell 110 is included in the condenser network 104 of testing oneself according to embodiments of the invention.
With reference now to Fig. 2,, Fig. 2 illustrates the detailed schematic circuit diagram of the condenser network 104 of testing oneself of Fig. 1.As mentioned below, when producing capacitive touch sensing device 109, the condenser network 104 of testing oneself is used for connecting (switch in) and cuts off (switch out) electric capacity parallelly connected with measured capacitance.The response of the capacitance of 109 pairs of periodically-varieds of capacitive touch sensing device is used for confirming the production test result to capacitive touch sensing device 109.Though Fig. 2 shows concrete circuit diagram, be suitable for using the incompatible design of any circuit bank that can produce the production test result condenser network 104 of testing oneself according to embodiments of the invention.In the embodiment of Fig. 2, show the condenser network 104 of testing oneself, it can be connected to a plurality of sensor electrode 106a, 106b and 106c.Also be suitable for having a plurality of condenser networks of testing oneself that are included in the sensor circuit 102 according to embodiments of the invention.In such embodiment, each sensor electrode can have the with it relevant special use condenser network of testing oneself, and perhaps two or more sensor electrodes can be shared the common condenser network of testing oneself.The employed condenser network of testing oneself of this working method and system that is used for testing capacitor formula touch sensing device can comprise more or less element; Even can comprise different elements, as long as the measured value that this condenser network of testing oneself can be carried out capacitance type sensor changes the expectation task corresponding to the amount of known capacitance.
The capacitance signal that causes change can impose on sensor, and can measure this capacitance signal in every way.In one embodiment, as shown in Figure 2, switch SW sst will float earth capacitance (floating capacitance) Csst and be connected to fixed voltage (using the required any control electron device as φ sst so in addition), but also have many other realizations and topology.In alternate embodiment; Coupled switch can be placed between testing capacitor and the metering circuit; Perhaps can in circuit, use or increase other impedances (for example, resistance, impedance network etc.) or active component (for example, current source, impact damper etc.) except that switch; So that signal is imposed on sensor, perhaps protect sensor not receive capacitive effect.For example, can isolate the electric capacity of testing oneself with resistance as substituting, thereby the coupling of the feasible electric capacity of testing oneself depends on excitation speed; Perhaps, in another embodiment, can keep electric capacity to continue to connect, but opening and closing protection or excitation waveform are to change the effective capacitance signal.These technology are relevant with the specific selection of capacitance touch method for sensing and sensing topology usually, and this is known for a person skilled in the art.All elements of the not shown capacitance touch sensing circuit of Fig. 2, this is because various methods availalbes are arranged equally.In one embodiment, can carry out filtering, sampling and digitizing (for example through ADC and relevant treatment electron device) to voltage VOUT, thereby can carry out digitizing relatively sensor measurement.In another embodiment, can under emulation mode, compare (for example, can come calculated difference), and the primary transducer measurement that only need sample bears results through electric charge from double sampling is subtracted each other.
With reference now to Fig. 3,, Fig. 3 illustrates according to the process flow diagram 300 that is used for capacitive touch sensing device is carried out the processing that this method of production test carries out.Generally speaking, as stated, the capacitive touch sensing device that needs test producing is with (before for example issuing the terminal user) assurance capacitive touch sensing device operate as normal before delivery.The sensitivity that is noted that capacitive touch sensing device possibly be inversely proportional to overall measurement electric capacity.As a result, the variation in the production of capacitive sensing apparatus or the assembling can cause the variation of sensitivity.The variation of these sensitivity is even more important for the capacitive touch sensing device with thicker panel (for example dielectric enclosure), and is especially true to capacitive buttons.The variation of sensitivity to be used for detecting spiral the degree of approach (hover proximity) require evenly to roll or the capacitive touch sensing device of indication performance also extremely important.Thereby, when under than thick dielectric material situation and/or in, using capacitive touch sensing device than zonule (for example cellular phone application), this production test ever more important that seems.Yet most of conventional test methodologies requires each capacitive touch sensing device of human operators manual test, or the capacitive touch sensing device of random test selection.This classic method cost is high, possibly require to use the special test anchor clamps of complex and expensive and require aligning with it; And this classic method has been introduced unacceptable turnout to production run and has been postponed.Usually, these classic methods comprise the condenser type proving installation are connected to known ground plate (or finger), and seek correct response or sensitivity reading.Like what below will go through, use the approaching ground connection material of condenser network 104 simulations of testing oneself or, make the production test procedure robotization by the ground connection material that capacitive touch sensing device 109 perceives according to embodiments of the invention.Through using this method, can be in time to carrying out production test effectively from each capacitive touch sensing device on the assembly line.In addition; The defective of introducing when this method that capacitive device is carried out production test can detect assembling (for example; From the cabling to the power supply, the short circuit of barricade or other sensing cablings); And use traditional compensation technique, these defectives can not be revised in the follow-up work of capacitive touch sensing device.
Like what below will describe in detail, this method uses the condenser network 104 of testing oneself of Fig. 1 to combine the capacitive touch sensing device 109 of 110 pairs of productions of test cell to test.In according to one embodiment of present invention; The production test result that capacitive touch sensing device is obtained be used for confirming capacitive touch sensing device characteristic, detect defective, and/or when producing capacitive touch sensing device, capacitive touch sensing device is carried out sensitivity adjustment.Should before the terminal user is given in final packaging and delivery, carry out production test, but even can before the assembling sensing module, begin production test, should be understood that and can carry out repeatedly production test to single assembly at different time and place.Particularly, 302, when producing capacitive touch sensing device 109, first value that this method sampling is corresponding with first channel of capacitive touch sensing device 109.More specifically, in one embodiment, comprise sensor circuit 102 sampling of the condenser network 104 of testing oneself with corresponding to the corresponding value of the channel of sensor electrode 106a.As stated; Be connected to a plurality of sensor electrode 106a, 106b and 106c though the condenser network 104 of testing oneself is shown, be suitable for also in sensor circuit 102, comprising that according to embodiments of the invention a plurality of condenser networks of testing oneself are to test a plurality of channels (or a plurality of channels of sequential testing) simultaneously.
Still with reference to 302 of figure 3, because the condenser network 104 of testing oneself is integrated in the sensor circuit 102, thereby this method does not need separately, complicacy and expensive dedicated test fixture.The additional areas that also need not be used for test point or sensor is connected with its related electrode.In addition; In an embodiment according to the present invention, external device (ED) (for example test cell 110) that can be through being connected to capacitive touch sensing device or inner uses that the BIST (Built-In Self Test) as the ASIC function starts the production test to capacitive touch sensing device in the sensor circuit 102 or the condenser network 104 of testing oneself.In addition; The capacitance touch sensing circuit 104 of testing oneself is applicable to most of capacitance touch sensing arrangement, comprising but be not limited to following structure: have The Linearization Design, Sigma (sigma)-Delta (delta) detection sensor of reciprocal capacitance sensitivity and the scanning sensor-based system of simultaneously a small amount of electrode sensor (for example electrode sensor) being sampled.
With reference now to 304 of Fig. 3; When capacitive touch sensing device 109 makes the 104 pairs of capacitive touch sensing devices 109 of condenser network of testing oneself apply signal, be used for capacitive touch sensing device is carried out this method sampling second value corresponding of production test with first channel of capacitive touch sensing device 109.Should be noted that and be used for this method that capacitive touch sensing device 109 carries out production test is applicable to execution in step 304 before or after execution in step 302.In addition, in an embodiment according to the present invention, in the process of producing capacitive touch sensing device, carry out the sampling of second value.In one embodiment, be used for capacitive touch sensing device is carried out the capacitor of this method connection known dimensions of production test, and the potential electrode sensor is to the response of this capacitance variations.Should be noted that changes in capacitance can be the variation that absolute single-ended electric capacity or both-end are striden appearance (double-ended trans-capacitance).The embodiment that is used for capacitive touch sensing device is carried out this method of production test in basis; Apply signal and be not limited to apply electric signal (voltage/current), become predetermined capacitance thereby can also include but not limited to apply predetermined capacitance variations or transducer sensitivity is changed scheduled volume.Then, sensor output should change the predetermined value relevant with predetermined capacitance.More specifically, in an embodiment according to the present invention, use switch one or more (known dimensions) capacitor to be isolated or is connected with one or more electrode sensors at every turn usually.In order to obtain second value corresponding, in one embodiment, transmit electric charge by switch, thereby observe capacitance variations by electrode sensor with first channel of capacitive touch sensing device 109.Alternatively, in order to obtain second value corresponding, in another embodiment, increase the electric charge on the electric capacity, thereby observe tangible capacitance variations by electrode sensor through other modes with first channel of capacitive touch sensing device 109.
Still refer step 304, are used for this method that capacitive touch sensing device carries out production test also is applicable to applying the sensor-based system that voltage and/or electric charge are confirmed the response of capacitive touch sensing device.In addition, in an embodiment according to the present invention, the test cell 110 of Fig. 1 can be controlled the work of the condenser network 104 of testing oneself.On the contrary, also be suitable for the work that condenser network 104 draws oneself up with testing oneself according to embodiments of the invention, and need not control from test cell 110.In according to one embodiment of present invention, test cell 110 communicates through the communication line that is present in the sensor circuit 102 with the condenser network 104 of testing oneself.
Still with reference to 304 of figure 3; Condenser network 104 is shown and is included in the sensor circuit 102 though in Fig. 1, test oneself, and is suitable for making the part work as the condenser network of testing oneself of the outer member that temporarily is connected to capacitive touch sensing device 109 equally according to embodiments of the invention.
With reference now to 306,, this method of being used for capacitive touch sensing device is carried out production test relatively (obtains) first value and (obtaining 304) second value 302, with the production test result of definite first channel to capacitive touch sensing device.In addition, in an embodiment according to the present invention, in the process of producing capacitive touch sensing device, carry out the comparison of first value and second value.That is the production test result that, can relatively receive and the result of expectation are to confirm poor between them.Like this; This method that is used for capacitive touch sensing device is carried out production test is each cabling or response how the problem of a plurality of cabling to applying electric capacity of identification sensor electrode easily, wherein this to apply electric capacity be that closing on of applying of outside influenced substituting of electric capacity.As a result, when capacitive touch sensing device still is in the production, this method just can easily detect a cabling and power supply, or other cablings between short circuit.Come this production test result of self-capacitance self-testing circuit to combine, compare, with the result of the production performance (for example problem) that produces further identification sensor with another expectation value with one of first value and second value or both.Thereby, be used for can guaranteeing not satisfy the standard of promising to undertake and the capacitive touch sensing device of performance requirement can not be distributed to the client to this method that capacitive touch sensing device carries out production test.Thereby; Being used for can detecting this method that capacitive device is carried out production test uses defective that traditional compensation technique can not revise in the follow-up work of capacitive touch sensing device (for example; From the cabling to the power supply, the short circuit of barricade or other cablings, or do not have correctly to connect the open circuit cabling of sensor electrode).This method that is used for capacitive touch sensing device is carried out production test can also detect the electric capacity gain error that is caused by protection, and can detect the cabling of disconnection.This method also is suitable for using the production test result to deconvoluting or sharpening for the response of each sensor electrode that links together.
In according to one embodiment of present invention, compare by the 104 pairs of values of condenser network of testing oneself, then the production test result is offered test cell 110.In according to another embodiment of the invention, the condenser network 104 of testing oneself offers test cell 110 with value, and then, test cell 110 compares and produce the production test result.Can also in test cell 110, compare production test result and expected result (for example nominal difference or limits value).Can be by the production test machine that is used to test a plurality of unit of producing in this comparing function that provides outside the sensor module or in sensor module with expected result.Expected result can send sensor module to, perhaps can the result be pre-programmed in the sensor module.(for example, have under the cellular situation of LCD display) in some cases, whether the unit of producing self can indicate its work normal, and need not to communicate with the independent production equipment that is used to test a plurality of unit of producing.
Another embodiment that is used for capacitive touch sensing device is carried out this method of production test in basis; After receiving the production test result, this method is classified to capacitive touch sensing device based on the production test result to first channel of capacitive touch sensing device.That is, embodiments of the invention can be used in process of production capacitive touch sensing device being carried out branch mailbox.As a result, in order for example to optimize performance, can select different capacitive touch sensing devices its running parameter is adjusted (for example tuning).In addition, in an embodiment according to the present invention, can in the process of producing capacitive touch sensing device, carry out this selection and handle with " tuning ".Should be appreciated that, in an embodiment according to the present invention, can be in sensor circuit 102, in the condenser network 104 of testing oneself or through using peripheral control unit (for example test cell 110), carry out this calculating and the correction of capacitance measurement.Perhaps; Can select performance be not optimum (promptly; In some test specification) some capacitive touch sensing devices; They are assembled in the unit of producing to performance requirement so strict (for example, more limited operating temperature range, more controlled environment, the assembling of stricter control etc.).Thereby, use the production test result to judge whether capacitive touch sensing device satisfies performance requirement according to embodiments of the invention.In according to one embodiment of present invention, the production test result is used to judge whether capacitive touch sensing device should be categorized into the substandard products case.
Can also use the production data of the classification of a plurality of sensor modules when comprising value, test result and production.The result write down to have help improve production run and output.The expected result of can performance as requested adjusting restriction based on production data.Similarly, can make that to produce back device defective relevant with its original production data again, and/or it is tested with definite suitable expected result again.Can on sensor module, the device that assembles, production equipment, store production data, and/or production data is sent to many other places.
Also be suitable for a plurality of channels of capacitive touch sensing device are sampled according to embodiments of the invention.In this method; Before 302～306 described processing of carrying out above Fig. 3, handle side by side afterwards or with this; This method of capacitive touch sensing device being carried out production test is when producing capacitive touch sensing device, and what the second channel of sampling and capacitive touch sensing device was corresponding first is worth.When capacitive touch sensing device makes the condenser network of testing oneself apply signal to capacitive touch sensing device, present embodiment second value corresponding of also sampling with the second channel of capacitive touch sensing device.The signal that is coupled to second channel from the condenser network of testing oneself needs not be directly (for example, its sensor electrode that can pass through other channels).Then, this method is this first value and second value relatively, to confirm the production test result to the second channel of capacitive touch sensing device.This method is particularly useful for judging whether first channel and second channel the coupling of non-expectation occurred.In addition, in an embodiment according to the present invention, carry out the sampling of first value and the sampling of second value basically simultaneously.On the contrary, in according to other embodiments of the invention, basic order is carried out the sampling of first value and the sampling of second value.Also be suitable for sampling first value when capacitive touch sensing device does not make the condenser network of testing oneself that capacitive touch sensing device is applied signal according to embodiments of the invention.In such embodiment,, capacitive touch sensing device when capacitive touch sensing device applies the secondary signal different with first signal, carries out the sampling of first value when making the condenser network of testing oneself.
As above said in detail, based on the production test result that second channel is obtained, can capacitive touch sensing device be classified (for example branch mailbox).Similarly, can be based on coming capacitive touch sensing device classify (for example branch mailbox) to the production test result of first channel with to the production test result's of second channel combination.And, the production test result of the second channel of capacitive touch sensing device can be used to judge whether capacitive touch sensing device satisfies performance requirement.According to being used for the embodiment that capacitive touch sensing device carries out this method of production test also is suitable for first channel of the basic touch sensing device of sampling capacitance formula simultaneously and the second channel of capacitive touch sensing device.In addition, can carry out the sampling of second channel of sampling and capacitive touch sensing device of first channel of capacitive touch sensing device simultaneously, but confirm its performance separately.
Except that above-described first value and second value, perhaps replace this first value and second value, also be suitable for sampling and more various other values according to various embodiments of the present invention.That is, when capacitive touch sensing device does not make the condenser network of testing oneself that capacitive touch sensing device is applied signal, be suitable for three value corresponding of sampling with first channel of capacitive touch sensing device according to embodiments of the invention.In this embodiment, with the identical mode of top detailed described mode, use the 3rd value and second value to produce difference according to embodiments of the invention, with second nominal difference relatively.The 3rd sampled value can be used for confirming noise and non-linear, but its purposes is not limited thereto.
A part that is used for capacitive touch sensing device is carried out this technology of production test comprises computer-readable and computer executable instructions, and these instructions are arranged in the for example computer usable medium of computer system.Promptly; Sensor circuit 102, test cell 110 and self-testing circuit 104 illustrate department of computer science and unify and (for example be provided with computer-readable medium; Random-access memory (ram) and/or ROM (read-only memory) (ROM)) examples of members; Wherein the unify parts that are provided with computer-readable medium of department of computer science can be used for realizing being used for capacitive touch sensing device is carried out this technological embodiment of production test, discuss in the face of this down.Should be appreciated that; Be used for can running in a plurality of various computing machine system or running in a plurality of various computing machine system this technology that capacitive touch sensing device carries out production test, this a plurality of various computing machine system comprises: universal network computer system, embedded computer system, router, switch, server apparatus, client device, various intermediate equipment/node, stand alone computer system etc.
Simplified summary is once mainly invented below this instructions discloses at least.
Invent the production test method of 1. 1 kinds of capacitive touch sensing devices, said production test method comprises:
When producing said capacitive touch sensing device, first value that sampling is corresponding with first channel of said capacitive touch sensing device;
When said capacitive touch sensing device makes the condenser network of testing oneself apply signal to said capacitive touch sensing device, second value that sampling is corresponding with said first channel of said capacitive touch sensing device; And
More said first value and said second value; To confirm production test result to said first channel of said capacitive touch sensing device; Wherein, in the process of producing said capacitive touch sensing device, carry out the sampling of said second value and the comparison of said first value and said second value.
Invention 2. is characterized in that according to invention 1 described production test method, also comprises:
Said production test result based on to said first channel of said capacitive touch sensing device classifies to said capacitive touch sensing device.
Invention 3. is characterized in that according to invention 1 described production test method, also comprises:
Use said production test result to adjust the running parameter of said capacitive touch sensing device.
Invention 4. is according to invention 3 described production test methods; It is characterized in that; The running parameter that the said production test result of said use adjusts said capacitive touch sensing device comprises: when producing said capacitive touch sensing device, use said production test result to adjust the said running parameter of said capacitive touch sensing device.
Invention 5. is characterized in that according to invention 1 described production test method, also comprises:
Use said production test result to judge whether said capacitive touch sensing device satisfies performance requirement.
Invention 6. is characterized in that according to invention 1 described production test method, also comprises:
When producing said capacitive touch sensing device, the 3rd value that sampling is corresponding with the second channel of said capacitive touch sensing device;
When said capacitive touch sensing device makes the said condenser network of testing oneself apply signal to said capacitive touch sensing device, the 4th value that sampling is corresponding with the said second channel of said capacitive touch sensing device; And
More said the 3rd value and said the 4th value are to confirm the production test result to the said second channel of said capacitive touch sensing device.
Invention 7. is characterized in that according to invention 6 described production test methods, also comprises:
Based on to the said production test result of said first channel of said capacitive touch sensing device with to the said production test result of the said second channel of said capacitive touch sensing device, said capacitive touch sensing device is classified.
Invention 8. is characterized in that according to invention 6 described production test methods, also comprises:
Use judges to the said production test result of said first channel of said capacitive touch sensing device with to the said production test result of the said second channel of said capacitive touch sensing device whether said capacitive touch sensing device satisfies performance requirement.
Invention 9. is characterized in that according to invention 6 described production test methods, said first channel of the basic said capacitive touch sensing device of sequential sampling and the said second channel of said capacitive touch sensing device.
Invention 10. is characterized in that said first channel of the said capacitive touch sensing device of sampling basically simultaneously and the said second channel of said capacitive touch sensing device according to invention 6 described production test methods.
Invention 11. is characterized in that according to invention 1 described production test method said first value corresponding with first channel of said capacitive touch sensing device of when producing said capacitive touch sensing device, sampling comprises:
When said capacitive touch sensing device does not make the said condenser network of testing oneself that said capacitive touch sensing device is applied said signal, said first value of sampling.
Invention 12. is characterized in that according to invention 11 described production test methods said said first value of when said capacitive touch sensing device does not make the said condenser network of testing oneself that said capacitive touch sensing device is applied said signal, sampling comprises:
When said capacitive touch sensing device makes the said condenser network of testing oneself apply the secondary signal that is different from said signal to said capacitive touch sensing device, said first value of sampling.
Invention 13. is characterized in that according to invention 1 described production test method said first value and said second value comprise:
Make the difference between said first value and said second value relevant with nominal difference.
Invention 14. is characterized in that according to invention 1 described production test method, also comprises:
When said capacitive touch sensing device does not make the said condenser network of testing oneself that said capacitive touch sensing device is applied said signal, the 3rd value that sampling is corresponding with said first channel of said capacitive touch sensing device.
Invention 15. is characterized in that according to invention 14 described production test methods, also comprises:
Use said the 3rd value and said second value to produce difference, to compare with second nominal difference.
Invent the production test system of 16. 1 kinds of capacitive touch sensing devices, said production test system comprises:
The condenser network of testing oneself is used for the sampling a plurality of values corresponding with first channel of said capacitive touch sensing device when producing said capacitive touch sensing device; And
Test cell, it is connected to the said condenser network of testing oneself, said test cell be used for the said condenser network collaborative work of testing oneself to produce production test result to said first channel of said capacitive touch sensing device.
Invention 17. is characterized in that according to invention 16 described production test systems the said condenser network of testing oneself is used for the sampling a plurality of values corresponding with a plurality of channels of said capacitive touch sensing device when producing said capacitive touch sensing device.
Invention 18. is according to invention 17 described production test systems; It is characterized in that, said test cell be used for the said condenser network collaborative work of testing oneself to produce production test result to each channel of said a plurality of channels of said capacitive touch sensing device.
Invention 19. is characterized in that according to invention 17 described production test systems the said condenser network of testing oneself is used for the basic sequential sampling a plurality of values corresponding with a plurality of channels of said capacitive touch sensing device when producing said capacitive touch sensing device.
Invent 20. 1 kinds of computer-readable mediums, on said computer-readable medium, embedded computer-readable code, said computer-readable code is used to make computing machine to carry out the production test method of capacitive touch sensing device, and said production test method comprises:
When producing said capacitive touch sensing device, receive first sampled value corresponding with first channel of said capacitive touch sensing device;
When said capacitive touch sensing device makes the condenser network of testing oneself apply signal to said capacitive touch sensing device, receive second sampled value corresponding with said first channel of said capacitive touch sensing device; And
Through more said first sampled value and said second sampled value, confirm production test result to said first channel of said capacitive touch sensing device.
Invention 21. is characterized in that according to invention 20 described computer-readable mediums, on said computer-readable medium, has embedded the computer-readable code that is used to make the following operation of said computing machine execution:
Said production test result based on to said first channel of said capacitive touch sensing device classifies to said capacitive touch sensing device.
Invention 22. is characterized in that according to invention 20 described computer-readable mediums, on said computer-readable medium, has embedded the computer-readable code that is used to make the following operation of said computing machine execution:
Use said production test result to adjust the running parameter of said capacitive touch sensing device.
Invention 23. is characterized in that according to invention 20 described computer-readable mediums, on said computer-readable medium, has embedded the computer-readable code that is used to make the following operation of said computing machine execution:
When producing said capacitive touch sensing device, first value that sampling is corresponding with the second channel of said capacitive touch sensing device;
When said capacitive touch sensing device makes the said condenser network of testing oneself apply signal to said capacitive touch sensing device, second value that sampling is corresponding with the said second channel of said capacitive touch sensing device; And
More said first value and said second value are to confirm the production test result to the said second channel of said capacitive touch sensing device.
Invention 24. is characterized in that according to invention 23 described computer-readable mediums, on said computer-readable medium, has embedded the computer-readable code that is used to make the following operation of said computing machine execution:
Based on to the said production test result of said first channel of said capacitive touch sensing device with to the said production test result of the said second channel of said capacitive touch sensing device, said capacitive touch sensing device is classified.
Invention 25. is characterized in that according to invention 23 described computer-readable mediums, on said computer-readable medium, has embedded the computer-readable code that is used to make the following operation of said computing machine execution:
Use judges to the said production test result of said first channel of said capacitive touch sensing device with to the said production test result of the said second channel of said capacitive touch sensing device whether said capacitive touch sensing device satisfies performance requirement.
The front is from explanation and purpose of description to being used for that capacitive touch sensing device is carried out the description that this technological specific embodiment of production test carries out.This description is not to be intended to exhaustive being used for capacitive touch sensing device is carried out this technology of production test or it is limited to disclosed precise forms, can carry out many distortion and change according to aforementioned teaching.Selecting and describing embodiment is this technological principle and its practical application that is used for capacitive touch sensing device is carried out production test in order to explain best, is used for capacitive touch sensing device is carried out this technology of production test and the various embodiment that conception is suitable for the various distortion of special-purpose thereby make those skilled in the art to utilize best.

Claims (22)

1. the production test method of a capacitive touch sensing device, said production test method comprises:
When producing said capacitive touch sensing device, first value that sampling is corresponding with first channel of said capacitive touch sensing device;
When said capacitive touch sensing device makes the condenser network of testing oneself apply signal to said capacitive touch sensing device, second value that sampling is corresponding with said first channel of said capacitive touch sensing device; And
More said first value and said second value; To confirm production test result to said first channel of said capacitive touch sensing device; Wherein, in the process of producing said capacitive touch sensing device, carry out the sampling of said second value and the comparison of said first value and said second value.
2. production test method according to claim 1 is characterized in that, also comprises:
Said production test result based on to said first channel of said capacitive touch sensing device classifies to said capacitive touch sensing device.
3. production test method according to claim 1 is characterized in that, also comprises:
Use said production test result to adjust the running parameter of said capacitive touch sensing device.
4. production test method according to claim 3; It is characterized in that; The running parameter that the said production test result of said use adjusts said capacitive touch sensing device comprises: when producing said capacitive touch sensing device, use said production test result to adjust the said running parameter of said capacitive touch sensing device.
5. production test method according to claim 1 is characterized in that, also comprises:
Use said production test result to judge whether said capacitive touch sensing device satisfies performance requirement.
6. production test method according to claim 1 is characterized in that, also comprises:
When producing said capacitive touch sensing device, the 3rd value that sampling is corresponding with the second channel of said capacitive touch sensing device;
When said capacitive touch sensing device makes the said condenser network of testing oneself apply signal to said capacitive touch sensing device, the 4th value that sampling is corresponding with the said second channel of said capacitive touch sensing device; And
More said the 3rd value and said the 4th value are to confirm the production test result to the said second channel of said capacitive touch sensing device.
7. production test method according to claim 6 is characterized in that, also comprises:
Based on to the said production test result of said first channel of said capacitive touch sensing device with to the said production test result of the said second channel of said capacitive touch sensing device, said capacitive touch sensing device is classified.
8. production test method according to claim 6 is characterized in that, also comprises:
Use judges to the said production test result of said first channel of said capacitive touch sensing device with to the said production test result of the said second channel of said capacitive touch sensing device whether said capacitive touch sensing device satisfies performance requirement.
9. production test method according to claim 6 is characterized in that, said first channel of the said capacitive touch sensing device of sequential sampling and the said second channel of said capacitive touch sensing device.
10. production test method according to claim 6 is characterized in that, said first channel of the said capacitive touch sensing device of sampling simultaneously and the said second channel of said capacitive touch sensing device.
11. production test method according to claim 1 is characterized in that, said first value corresponding with first channel of said capacitive touch sensing device of when producing said capacitive touch sensing device, sampling comprises:
When said capacitive touch sensing device does not make the said condenser network of testing oneself that said capacitive touch sensing device is applied said signal, said first value of sampling.
12. production test method according to claim 11 is characterized in that, said said first value of when said capacitive touch sensing device does not make the said condenser network of testing oneself that said capacitive touch sensing device is applied said signal, sampling comprises:
When said capacitive touch sensing device makes the said condenser network of testing oneself apply the secondary signal that is different from said signal to said capacitive touch sensing device, said first value of sampling.
13. production test method according to claim 1 is characterized in that, said first value and said second value comprise:
Make the difference between said first value and said second value relevant with nominal difference.
14. production test method according to claim 1 is characterized in that, also comprises:
When said capacitive touch sensing device does not make the said condenser network of testing oneself that said capacitive touch sensing device is applied said signal, the 3rd value that sampling is corresponding with said first channel of said capacitive touch sensing device.
15. production test method according to claim 14 is characterized in that, also comprises:
Use said the 3rd value and said second value to produce difference, to compare with second nominal difference.
16., it is characterized in that said production test method can be in time to testing from each capacitive touch sensing device on the assembly line according to each described production test method in the claim 1 to 15.
17. the production test system of a capacitive touch sensing device, said production test system comprises:
The condenser network of testing oneself is used for the sampling a plurality of values corresponding with first channel of said capacitive touch sensing device when producing said capacitive touch sensing device; And
Test cell, it is connected to the said condenser network of testing oneself, said test cell be used for the said condenser network collaborative work of testing oneself to produce production test result to said first channel of said capacitive touch sensing device.
18. production test according to claim 17 system is characterized in that, the said condenser network of testing oneself is used for the sampling a plurality of values corresponding with a plurality of channels of said capacitive touch sensing device when producing said capacitive touch sensing device.
19. production test according to claim 18 system; It is characterized in that, said test cell be used for the said condenser network collaborative work of testing oneself to produce production test result to each channel of said a plurality of channels of said capacitive touch sensing device.
20. production test according to claim 18 system is characterized in that, the said condenser network of testing oneself is used for the sequential sampling a plurality of values corresponding with a plurality of channels of said capacitive touch sensing device when producing said capacitive touch sensing device.
21., it is characterized in that said production test is carried out repeatedly at different time according to each described production test system in the claim 17 to 20.
22., it is characterized in that said production test system can be in time to testing from each capacitive touch sensing device on the assembly line according to each described production test system in the claim 17 to 20.
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